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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b40b5ef74021ba2dd1f029470dcfba7c9d55343d56f537565b41b8c7fb02a10' 
  AND token = '3QjRYEJWwkVhcdEM/fJ0e3jnr9a23YldvMQza9OX63A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}